Flat Roof Plywood

The minimum plywood for roofing.

Flat roof plywood.

Flat roofs aren t architecturally logical as rain and snow will shed much more quickly off a sloped roof. However heavier roof loads may require the use of 3 4 in cdx plywood for roof sheathing. Different material options types of roof plywood. Most roofs are spaced at least 20 inches apart.

Traditionally 1 2 in cdx plywood was common choice with 24 in rafter spacing. A roof that lays practically flat will have a much heavier load than a steeper roof that allows rain snow and ice to roll right off. Plywood on the other hand is made with thin sheets of wood that have been cut from a spinning log then glued together. 1 2 or 3 4 inch plywood for roof sheathing.

This minimum wouldn t work if you have a flat roof. Osb and plywood come in thicknesses ranging from 5 16 to 3 4 inch and the thickness needed for a particular roof depends on several factors including rafter spacing expected load and roof design. Of course flat roofs are not flat but have a very slight roof pitch of between 1 4 to 1 2 per foot. Rafters run from the peak of the roof.

For this you can either go for a half inch or 5 8 inch. Yet for historic modern style buildings like this old house s cambridge tv project flat roofs are at the core of the architecture meant to reflect the broad horizontal lines of the natural landscape. Plywood sheathing delivers outstanding rigidity strength and versatility and is an excellent choice for light frame wall and roof assemblies in weather protected applications. More product details close.

Yes there are several different material options and types of roof plywood. Just enough slope to drain water but also flat enough to be a problem if not constructed properly. Rafters that are slightly farther apart might require inch or 5 8 inch thick plywood. Osb is made of small and fairly rectangular shaped wood chips from small resinous trees which are bonded into a panel form with wax and synthetic resin.

In this case you can t use a 3 8 inch thick sheet. Especially in relation to osb or plywood use for roofs walls floors.